Cement for uniting wood.



UNITED STATES J OHANN HEINRICH JULIUS BARTELS, OF WATERLOO, NEAR LIVERPOOL ENGLAND.

CEMENT FOR UNITING WOOD.

$PECIFIGATION forming part of Letters Patent No. 725,816, dated April 21, 1903.

Application filed January 20, 1902. Serial No. 90,640. (No specimens.)

T0 aZZ 1072 0712 it flea/y concern:

Be it known that I, J OHANN HEINRICH J UL- IUS BARTELS, asubjectof the Emperor of Germany, residing at 27 Marine Crescent, Waterloo, near Liverpool, in the county of Lancaster, England, have invented a new or Improved Cement for Uniting Pieces of Wood, of which the following is a specification.

This invention has for its object a cement or glue which will retain its adhesive qualities and be specially applicable for wood-cemen ting-such, for example, as for cementing together veneers or layers that are compressed into a composite sheet by pressure-dies and heat to form barrels, pipes, and other receptacles.

My invention consists in taking ordinary animal glue such as is made from the parings of hoofs of oxen and other animals or the thick hides or, in fact, animal skin in every form and possessing great adhesive force. This is treated with weak milk of lime, which renders the glue soft and then dissolves it, the glue retaining the property of gluing surfaces together when it dries. I then mix With linseed-meal in the proportion of about one to two parts of linseed-meal to nine parts of glue and add about one part of ordinary commercial silicate of soda. The effect of these ingredients is to provide a cement which can be coated on the surfaces to be cemented together and, furthermore, which sets and bardens quicker than ordinary glue, besides having much greater adhesive force.

The surfaces of the wooden sheets to be united are covered with a thin coating of the cement. Then the surfaces are brought together so that they touch each other and are submitted for a time to pressure and heat, which effects the adhesion.

I declare that what I claim is- 1. A cement to unite pieces of wood by the aid of pressure and heat, consisting of animal glue, linseed-meal and silicate of soda, substantially as described.

2. A cement to unite pieces of wood, consisting of animal glue dissolved in weak lime- 

